//Copyright Mangolab Ltd. 2009. All rights reserved.
//SUMMARY:
// Script to find an item on a sibling frame 
// which must be called "searchframe"
//HISTORY:
// 23.10.08 Version 1.0 - <FC> - Reviewd / FB ref: CASE:1496
// 01/05/09 Version 1.0 - <FC> - Updated to use SearchAndHighlight / FB ref: CASE:1705
//TO DO:
// Script needs updating for Mozilla
// using: http://www.nsftools.com/misc/SearchAndHighlight.htm

//the keyword we are looking for
var glbKeyword = "";
//how many times we search
var glbSearch = 1;
//search frame 
var myBody = window.parent.searchframe;
var glbScrollTo = 1;

function findInPage() {
	var strSearch = document.getElementById('EdtSearchText').value;
	var str=strSearch.toLowerCase();
	var myHighlightStartTag = '';
	var myHighlightEndTag = '</span>';
	
	if (strSearch == "") {
		alert("Please type in your search.");
		return;
	}
	//if looking for new keyword highlight and scroll to first found and increase the serach index (glbSearch)  by 1 
	if(str != "" && str != glbKeyword){
		if(glbSearch > 1){
			for (var i = 1; i < glbSearch; i++){
				var strClass = "firstFound" + i + " highlight";
				console.log(strClass);
				$ = window.parent.searchframe.$;
				$("span").removeClass(strClass);
			}
		}
		glbSearch = 1;
		myHighlightStartTag = '<span class="firstFound' + glbSearch + ' highlight">';
		glbScrollTo = 1;
		highlightSearchTerms(str, false, true, myHighlightStartTag, myHighlightEndTag);
		ScrollTo(glbScrollTo);
		glbKeyword = str;
		glbSearch--;
//otherwise scroll to next one found and keep same index.
	} else {
		glbScrollTo++;
		if(glbScrollTo > glbSearch){glbScrollTo = 1}
		ScrollTo(glbScrollTo);
	}
	return true;
}

function ScrollTo(index){
	var temp = index - 1;
	var indPrevious = (temp === 0)? glbSearch - 1 : temp;
	var strHighlightPrev = ".firstFound" + indPrevious;
	var strScrollTo = ".firstFound" + index;
	$(myBody).scrollTo(strScrollTo);
	$ = window.parent.searchframe.$;
	$(strScrollTo).addClass("highlight2");	
	$(strHighlightPrev).removeClass("highlight2");	
	return;
}

function UpdateHighlightTag(){
	glbSearch++;
	var strTag = '<span class="firstFound' + glbSearch + ' highlight">';
	return strTag;
}


/*
 * This is the function that actually highlights a text string by
 * adding HTML tags before and after all occurrences of the search
 * term. You can pass your own tags if you'd like, or if the
 * highlightStartTag or highlightEndTag parameters are omitted or
 * are empty strings then the default <font> tags will be used.
 */
function doHighlight(bodyText, searchTerm, highlightStartTag, highlightEndTag) 
{
  // the highlightStartTag and highlightEndTag parameters are optional
  if ((!highlightStartTag) || (!highlightEndTag)) {
    highlightStartTag = "<font style='color:blue; background-color:yellow;'>";
    highlightEndTag = "</font>";
  }
  
  // find all occurences of the search term in the given text,
  // and add some "highlight" tags to them (we're not using a
  // regular expression search, because we want to filter out
  // matches that occur within HTML tags and script blocks, so
  // we have to do a little extra validation)
  var newText = "";
  var i = -1;
  var lcSearchTerm = searchTerm.toLowerCase();
  var lcBodyText = bodyText.toLowerCase();
    
  while (bodyText.length > 0) {
    i = lcBodyText.indexOf(lcSearchTerm, i+1);
    if (i < 0) {
      newText += bodyText;
      bodyText = "";
    } else {
      // skip anything inside an HTML tag
      if (bodyText.lastIndexOf(">", i) >= bodyText.lastIndexOf("<", i)) {
        // skip anything inside a <script> block
        if (lcBodyText.lastIndexOf("/script>", i) >= lcBodyText.lastIndexOf("<script", i)) {
          newText += bodyText.substring(0, i) + highlightStartTag + bodyText.substr(i, searchTerm.length) + highlightEndTag;
          bodyText = bodyText.substr(i + searchTerm.length);
          lcBodyText = bodyText.toLowerCase();
          i = -1;
					highlightStartTag = UpdateHighlightTag();
        }
      }
    }
  }
  
  return newText;
}


/*
 * This is sort of a wrapper function to the doHighlight function.
 * It takes the searchText that you pass, optionally splits it into
 * separate words, and transforms the text on the current web page.
 * Only the "searchText" parameter is required; all other parameters
 * are optional and can be omitted.
 */
function highlightSearchTerms(searchText, treatAsPhrase, warnOnFailure, highlightStartTag, highlightEndTag)
{
  // if the treatAsPhrase parameter is true, then we should search for 
  // the entire phrase that was entered; otherwise, we will split the
  // search string so that each word is searched for and highlighted
  // individually
  if (treatAsPhrase) {
    searchArray = [searchText];
  } else {
    searchArray = searchText.split(" ");
  }
  
  //if (!document.body || typeof(document.body.innerHTML) == "undefined") {
  if (!window.parent.searchframe.document.body || typeof(window.parent.searchframe.document.body.innerHTML) == "undefined") {
    if (warnOnFailure) {
      alert("Sorry, for some reason the text of this page is unavailable. Searching will not work.");
    }
    return false;
  }
  
  //var bodyText = document.body.innerHTML;
  var bodyText = window.parent.searchframe.document.body.innerHTML;
  for (var i = 0; i < searchArray.length; i++) {
    bodyText = doHighlight(bodyText, searchArray[i], highlightStartTag, highlightEndTag);
  }

  window.parent.searchframe.document.body.innerHTML = bodyText;
  //document.body.innerHTML = bodyText;
  return true;
}


/*
 * This displays a dialog box that allows a user to enter their own
 * search terms to highlight on the page, and then passes the search
 * text or phrase to the highlightSearchTerms function. All parameters
 * are optional.
 */
function searchPrompt(defaultText, treatAsPhrase, textColor, bgColor)
{
  // This function prompts the user for any words that should
  // be highlighted on this web page
  if (!defaultText) {
    defaultText = "";
  }
  
  // we can optionally use our own highlight tag values
  if ((!textColor) || (!bgColor)) {
    highlightStartTag = "";
    highlightEndTag = "";
  } else {
    highlightStartTag = "<font style='color:" + textColor + "; background-color:" + bgColor + ";'>";
    highlightEndTag = "</font>";
  }
  
  if (treatAsPhrase) {
    promptText = "Please enter the phrase you'd like to search for:";
  } else {
    promptText = "Please enter the words you'd like to search for, separated by spaces:";
  }
  
  searchText = prompt(promptText, defaultText);

  if (!searchText)  {
    alert("No search terms were entered. Exiting function.");
    return false;
  }
  
  return highlightSearchTerms(searchText, treatAsPhrase, true, highlightStartTag, highlightEndTag);
}


/*
 * This function takes a referer/referrer string and parses it
 * to determine if it contains any search terms. If it does, the
 * search terms are passed to the highlightSearchTerms function
 * so they can be highlighted on the current page.
 */
function highlightGoogleSearchTerms(referrer)
{
  // This function has only been very lightly tested against
  // typical Google search URLs. If you wanted the Google search
  // terms to be automatically highlighted on a page, you could
  // call the function in the onload event of your <body> tag, 
  // like this:
  //   <body onload='highlightGoogleSearchTerms(document.referrer);'>
  
  //var referrer = document.referrer;
  if (!referrer) {
    return false;
  }
  
  var queryPrefix = "q=";
  var startPos = referrer.toLowerCase().indexOf(queryPrefix);
  if ((startPos < 0) || (startPos + queryPrefix.length == referrer.length)) {
    return false;
  }
  
  var endPos = referrer.indexOf("&", startPos);
  if (endPos < 0) {
    endPos = referrer.length;
  }
  
  var queryString = referrer.substring(startPos + queryPrefix.length, endPos);
  // fix the space characters
  queryString = queryString.replace(/%20/gi, " ");
  queryString = queryString.replace(/\+/gi, " ");
  // remove the quotes (if you're really creative, you could search for the
  // terms within the quotes as phrases, and everything else as single terms)
  queryString = queryString.replace(/%22/gi, "");
  queryString = queryString.replace(/\"/gi, "");
  
  return highlightSearchTerms(queryString, false);
}


/*
 * This function is just an easy way to test the highlightGoogleSearchTerms
 * function.
 */
function testHighlightGoogleSearchTerms()
{
  var referrerString = "http://www.google.com/search?q=javascript%20highlight&start=0";
  referrerString = prompt("Test the following referrer string:", referrerString);
  return highlightGoogleSearchTerms(referrerString);
}